<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.20</title>
</head>
<body>
    <script>
        let {toString:s} = 123;
        console.log(s === Number.prototype.toString);   //true

        let {toString:b} = true;
        console.log(b === Boolean.prototype.toString);  //true
    </script>
</body>
</html>